For this type of hike, a good goal to train up to is to feel comfortable hiking 10-miles with significant weight and/or 14 or 16 miles with a day backpack. Start with 2 or 4 miles and add on 1.5 to 2 miles each weekend, such as: 1 – Training Hike: 4 miles. 2 – Training Hike: 6 miles.